I carry the stripped down compressor from walmart for about 10 bucks. I use the string plugs from walmart also. I found it a lot easier to use the "T" handle plug kit as it gives you better control and handling when installing the plug.
I'm with you right down the line Bubbles. I got string plugs, glue and decent size T-handle auger and plugger (because the little screwdriver-handled tools can kill your hands trying to push through a radial) at Napa, and the Slime pump from Wallyworld. With the cover off the pump, the whole kit fits inside the little hard zipper case the pump comes with. And the pump SAE plug goes right into the Battery tender pigtail already on the bike. Also carry a few extra tools besides the OE kit, and a headband LED light to work in the dark.